Venta dehumidifier displays F4 and stops, often after running briefly

Safety: Unplug the dehumidifier and allow it to cool before servicing. Refrigeration components can be hot.

• Check airflow: Remove and clean the air filter with mild soap and water. Ensure the intake and exhaust grilles are not blocked.
• Clean condenser: Access the condenser coil (usually behind the front or rear panel) and gently vacuum or brush off dust. Do not bend the fins.
• Verify fan operation: Turn the unit on and confirm that the fan runs whenever the compressor is on. If the fan is not running or is very slow, replace the condenser fan motor.
• Environment: Ensure the unit is used within the specified temperature range and not in a confined, unventilated space.
• Persistent F4: If F4 continues after cleaning and fan repair, the compressor may be overheating or the high-pressure switch may be tripping. This requires diagnosis of the sealed system by a qualified refrigeration technician.